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Stock-Based Compensation - Stock Options - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share Price $ 6.55  
Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Employee stock options vesting provisions, description Employee stock options are subject to installment vesting typically over a period of not less than three years  
Period of termination of employment 180 days  
Stock options granted period 7 years  
Options exercised 6,000  
Intrinsic value $ 53.0 $ 0.1
Options Outstanding, Granted 0 0
Period of expected life, options granted 5 years  
Stock Options [Member] | Stock Option Plan One [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Proceeds From Stock Options Exercised $ 8.0 $ 0.1
Options exercised   9,412
Stock Options [Member] | Stock Option Plan Two [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options exercised 6,000 52,355
Shares issued 1,420 10,194
Stock Options [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options vested in remaining period 3 years